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Phonic 740 200w Amp

Discussion in 'Electronic Repair' started by Bob, Jul 26, 2004.

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  1. Bob

    Bob Guest

    Hi all,

    As I've been unable to source a diagram for this model I've made an
    attempt at drawing it out myself. I thought I was quite 'au fait' with
    amp design but this one is something I haven't seen before.
    The outputs are 2SC5200 and 2SA1943 but there are also RFP50NO6 fet's
    which appear to be fed from another power line from the main semis and
    connect to their collectors. The o/p trannies are fed to their power
    rails by diodes.
    I've had a burn up of one channel and before I start replacing
    everything I want to make sure I understand how it functions.
    Are there any schematics out on the web with this type of design as that
    would save me a lot of time tracing the board.

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